Princeton Borough Police

Princeton Borough Police is the municipal law-enforcement agency for the City of Princeton in Mercer County, New Jersey, based at 1 Valley Road. The department serves residents, businesses, and visitors within Princeton limits in Mercer County. Its area of responsibility covers patrol and response to calls for service, traffic enforcement, criminal investigations inside the city, and community policing programs that support local neighborhoods and commercial corridors. Princeton sits in a New Jersey corridor that mixes residential neighborhoods with local commerce, and the police department is the primary local law-enforcement presence for day-to-day public safety inside the city. Public safety emergencies in Princeton should be reported by dialing 911.

According to the U.S. Census Bureau (ACS 2023), Princeton, NJ has an estimated population of 30,451.